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Zepler [3.9K]
3 years ago
10

2/9n + 1/2 = 2/3(n+3) what does n equal?

Mathematics
1 answer:
Svetradugi [14.3K]3 years ago
7 0
\dfrac{2}{9}n+\dfrac{1}{2}=\dfrac{2}{3}(n+3)\ \ \ \ \ |multiply\ both\ sides\ by\ 18\\\\2\cdot2n+9=6\cdot2(n+3)\\\\4n+9=12(n+3)\\\\4n+9=12n+36\ \ \ \ |subtract\ 9\ from\ both\ sides\\\\4n=12n+27\ \ \ \ |subtract\ 12n\ from\ both\ sides\\\\-8n=27\ \ \ \ \ |divide\ both\ sides\ by\ (-8)\\\\n=-\dfrac{27}{8}\\\\n=-3\dfrac{3}{8}
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If 0° ≤ θ ≤ 90° and cosθ = 11/15 , what is the value of sin (90° - θ)?
igor_vitrenko [27]
11/15=0.7333
cos^{-1}(0.7333) =42.83342
sin(90-47.166572) = 0.7333

first, find the numeric value for 11/15
second to find theta, simply do the <em>inverse</em> cos (which is cos^-1) of the first answer.
now you know theta, just do the sin of 90 - theta and that's it!

since you know whatr cos(theta) is, you just take the inverse cos of that number to get theta and 'reverse' cos, essentially. you are just solving for theta, by reversing the cos function with cos^-1
please mark as brainliest!
7 0
3 years ago
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Someone plz help on # 15 (idk what to do) :/
aleksklad [387]

Answer:

2x-5= -20

move -5 to the other side

sign changes from -5 to 5

2x-5+5= -20+5

2x= -15

divide by 2 for both sides

2x/2= -15/2

cross out 2 and 2, divide by 2 and 2 and then becomes x

x= -15/2

4 0
3 years ago
Is it C or no? Can u help please
Westkost [7]
 the answer is Probably C.

7 0
3 years ago
HELP ASAP!!
Grace [21]

Ze Answer to Question:

(In order from most specific to least specific): Integer, Whole number, Counting/Natural Number, Rational Number...

Have a splendid day. My apologies if a sudden mistake is made.

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3 years ago
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Can somebody help me with this
Lera25 [3.4K]

Answer:

A

Step-by-step explanation:

It’s just like adding except with a variable so 5x+3x is like 5+3 except with x so 8x+3=16

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3 years ago
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